OpenAIGPT-5.5VSxAIGrok 4.3
Our Take
Standardized reasoning and coding benchmarks are currently pending verification for one or both of these models. We recommend testing GPT-5.5 and Grok 4.3 directly in their respective provider playgrounds to see which fits your specific prompt styles best.
Was this recommendation helpful?
Benchmarks & Scores
Coding (swe-bench-pro)
58.6%excellent at multi-file repositories, autonomous agents, and industrial codebases
Reasoning (gpqa-diamond)Winner (+3.5%)
93.6%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$11.25Input: $5.00 | Output: $30.00Context WindowLarger
1.05M tokensBenchmarks & Scores
Coding (swe-bench-pro)
N/Aexcellent at multi-file repositories, autonomous agents, and industrial codebases
Reasoning (gpqa-diamond)
90.1%graduate-level science QA
Cost & Context
Cost (per 1M tokens)7.2x cheaper
$1.56Input: $1.25 | Output: $2.50Context Window
1.05M tokensFrequently Asked Questions about GPT-5.5 vs Grok 4.3
Grok 4.3 is cheaper than GPT-5.5. Grok 4.3 has a blended cost of $1.56/1M tokens, which is about 7.2x cheaper than GPT-5.5 at $11.25/1M tokens.
Related Matchups
Explore similar comparisons for GPT-5.5 and Grok 4.3.
Do you want to find a model for your constraints?
Use our interactive model finder to filter LLMs by reasoning capability, coding performance, cost, and context length.